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' R. N. CHERRY.

SELF FBEDING. RATGHET DML?. No. 296.924. Patented Apr. 15, 1884.

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UNTTED STATES PATENT "Charna ROBERT N. CHERRY, OF` JERSEY CITY, NEVUERSEY.

SELF-FEIEDING FlATCHET-DRILL.`

SPECIFICATION forming part 0f Letters Patent NO. 296,924, dated Arpril15, 1884.

Application filed November 15, i883. (No model.)

To @ZZ whom it may concer/L f Be it known that I, ROBERT N. CHERRY, acitizen of the United States, residing at Jersey City, in the county ofHudson and State of New Jersey, have invented a new and usefulSelfFeeding Ratchet-Drill, of which the following is a specification.

My invention consists in a device for automatically operating thefeed-screw of an ordinary ratchet-drill. I obtain this result by themechanism illustrated in the accompanying drawings, in which- Figure` lis a longitudinal section of that part of the tool to which my inventionrelates. Fig. 2 is a sectional plan on line :c a: of Fig. l. Fig. 8 is asect-ion on line YY of Fig. l, showing the contour of the casing D. Fig.4 is a vertical central section of a drill containing my improvement.

Similarlettersrefer to similar parts throughout the several views.

Referring to the drawings, A is the wrench, B the stock, and C thefeed-screw, of an ordinary ratchet-drill.

e is a groove out in the inner face of the wrench A.

L is a crown ratchet-wheel formed on th stock B.

L is a crown ratchet-wheel having a circular opening about its axis, bywhich it is slipped upon the stock B.

f is a rib formed on the ratchet L. The rib f slides freely in thegroove c. It will be seen that the-wheel L, through the rib f sliding inthe groove e, will partake of motion from the wrench A.

d are teeth formed on the wheel L', adapted to engage with the teeth b,formed on the wheel L.

a. is a spring resting upon the nut I, and bearing on the under face ofthe wheel L. The spring a operates to keep the teeth d in engagementwith the teeth Z, and at the saine time to permit the teeth to play pasteach other during the operation of the wrench.

D is a casing fitted loosely on the stock B, the stock being free torevolve in the same.

E is a spur-gear screwed rigidly on the end of stock B. E is a spur-gearmeshing with E and carried on the stud G.y The wheels E and E are boredeccentri'cally, for a purpose to be hereinafter shown.

H is a ratchet-wheel having a feather, o, sliding in the spline p, cutin the feed-screw C.

h is a pawl carried by a pin, t', the pin being stepped in either of theholes n in wheel E.

J is a plate held by the screw K for the purpose of inclosing the works.

m is a glass plate or disk, to be hereinafter explained.

s s s are holes in the feedscrew, to be used for inserting a small rodfor,the purpose of slacking down the screw when a hole is tobe drilledpart way through a piece of metal.

l r is a hole in the casing D, for a purpose to be hereinafterexplained. The holes t in the screw K are to enable it to be crowdedsnugly to the plate J by passing a rod through the holes. The feed-screwC is threaded into the upper end of the stock B, so as to be rotated bythe stock; but the pawl hacts against the ratchet `H to give the screw Ca slower movenient than the stock B. i

' Operation: By vibrating the wrench A the stock B is caused to revolve,carrying with it the eccentric-gear E, feed-screw C, and ratchet-wheelH, all at a uniform speed. The ec centric wheel E engages with anddrives the eccentric wheel E', which in turn carries the pawl h througha complete circle. At each revolution the pawl It engages with theratchet H and retards its speed. The toe q of the pawl h leaves theratchet-wheel H in the proper position to engage with the ratchet at itsnext revolution; but should the pawl lose its proper position by turningon its axis `while the wheel F/ is making a revolution, then the heel zof the pawl 7L will tread on the face of the ratchet H, thereby placingthe toe of the pawl in position to again engage with the wheel H. Theradius of the ratchet Hbeing greater than theradius from the holes a tothe center of the wheel E', it is obvious that the teeth of the ratchetH travel faster than the toe q of the pawl h; hence when the toe q ofthe pawl h. is in engagement with the teeth of the ratchet H it followsthat the ratchet-wheel, with the feed-screw C, will revolve slower thanthe stock B, thus feeding the drill to its work; and, further, thewheels E and E' being eccen- IOO tric, the wheel E being` carried at auniform speed with the stock B, it follows that the speed of E will varyat every point between its least and-greatest radii; hence by shiftingthe pawl hin the holes n a slow, Inedinin, or fast feed is obtained. Theglass plate m is to enable the operator to see Without removing theplate J in which of the holes n the pawl is placed.

To operate the tool, place it in an ordinary brace or clamp; then passany small rod through the hole r and allow the rod to bear against thebrace or clamp, thus preventing the easing I) from revolving with theStock B, and thereby producing the feed.

Having thus described my invention, I claim asnew and desire to secureby Letters Patent- The combination of the eccentric Wheels E and E, theratchet H, 'pawl h, feed-screw C, and stock B, substantially as hereinshown 2o and described.

RCBT. N. CHERRY.

vifitnesses:

JOHN M. CHERRY, REUBEN B. CHERRY.

